AZ80镁合金动态再结晶软化行为研究<sup>*</sup>

doi:10.11900/0412.1961.2016.00051

金属学报

2016, Vol. 52

Issue (9): 1123-1132 DOI: 10.11900/0412.1961.2016.00051

论文

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AZ80镁合金动态再结晶软化行为研究^*

蔡贇¹,孙朝阳¹(

),万李²,阳代军²,周庆军²,苏泽兴¹

1 北京科技大学机械工程学院, 北京 100083
2 首都航天机械公司, 北京 100076

STUDY ON THE DYNAMIC RECRYSTALLIZATION SOFTENING BEHAVIOR OF AZ80 MAGNESIUM ALLOY

Yun CAI¹,Chaoyang SUN¹(

),Li WAN²,Daijun YANG²,Qingjun ZHOU²,Zexing SU¹

1 School of Mechanical and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 Capital Aerospace Machinery Company, Beijing 100076, China

引用本文:

蔡贇,孙朝阳,万李,阳代军,周庆军,苏泽兴. AZ80镁合金动态再结晶软化行为研究^*[J]. 金属学报, 2016, 52(9): 1123-1132.
Yun CAI, Chaoyang SUN, Li WAN, Daijun YANG, Qingjun ZHOU, Zexing SU. STUDY ON THE DYNAMIC RECRYSTALLIZATION SOFTENING BEHAVIOR OF AZ80 MAGNESIUM ALLOY[J]. Acta Metall Sin, 2016, 52(9): 1123-1132.

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摘要:

采用等温压缩实验获得了变形温度为200~400 ℃, 应变速率为0.001~1 s^-1的AZ80镁合金的流变应力曲线, 考虑动态硬化及软化特性描述了AZ80镁合金热变形过程动态再结晶主导的软化行为. 提出基于动态材料模型的应变速率敏感性指数表征动态再结晶引起的能量耗散, 该指数通过引入动态再结晶体积分数描述微观组织演化的耗散功. 考虑变形温度和应变速率构建了不同应变的应变速率敏感性指数图, 实现应变速率敏感性指数对动态再结晶软化行为的量化表征. 在此基础上, 研究了变形温度、应变速率对动态再结晶临界条件及演化过程的影响, 重点分析了不同应变的应变速率敏感性指数图特征. 结果表明: 随着变形温度的升高和应变速率的降低, 动态再结晶软化临界应变减小, 动态再结晶体积分数增加; 应变速率敏感性指数与动态再结晶体积分数正相关, 指数大于0.21的区域对应着高动态再结晶体积分数, 且均位于低应变速率下, 并通过动态再结晶软化的微观组织进行了验证.

关键词 ：镁合金, 动态再结晶, 变形行为, 应变速率敏感性

Abstract：

Magnesium alloys are considered as one of the lightest structural metallic materials with excellent properties such as high specific strength, superior damping characteristics and electromagnetic shielding performance. In order to improve the mechanical properties of magnesium alloys, the hot rolling, hot extrusion and other hot forming processes are often introduced to produce the high performance parts. Both of the two softening mechanisms, dynamic recovery and dynamic recrystallization (DRX), occur during the hot deformation. As an important softening mechanism in hot processing, DRX is beneficial to obtaining fine grains structure, eliminating defects and improving mechanical properties for magnesium alloys. In this work, isothermal compression tests of AZ80 magnesium alloy were conducted on Gleeble thermo-mechanical simulator in the temperature range of 200 to 400 ℃ and strain rate range of 0.001 to 1 s^-1. In view of the dynamic hardening and softening mechanisms, the softening behavior of AZ80 magnesium alloy, dominated by dynamic recrystallization, was depicted. Dynamic recrystallization volume fraction was introduced to reveal the power dissipation during the microstructural evolution which was indicated by the strain rate sensitivity value based on the dynamic material model. To quantify the dynamic recrystallization softening behavior by the strain rate sensitivity (SRS) value, the SRS value distribution maps were constructed depending on various temperatures and strain rates. Therefore, the critical conditions and evolution process were studied in terms of temperatures and strain rates, while features of the SRS value distribution maps at different strains were deeply investigated. It can be concluded that the value of dynamic recrystallization critical condition decreases and dynamic recrystallization volume fraction increases when the temperature increases and strain rate decreases during the deformation. The strain rate sensitivity was positive correlated with the dynamic recrystallization volume fraction. It has been verified effectively by the analysis of microstructure that the region in which the strain rate sensitivity value is above 0.21 corresponds to the higher dynamic recrystallization volume fraction and lower strain rate.

Key words： magnesium alloy dynamic recrystallization deformation behavior strain rate sensitivity

收稿日期: 2016-02-01

基金资助:* 国家自然科学基金委员会-中国工程物理研究院联合基金项目U1330121, 国家自然科学基金项目51575039, 以及中南大学高性能复杂制造国家重点实验室开放课题基金项目Kfkt2015-01资助

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https://www.ams.org.cn/CN/10.11900/0412.1961.2016.00051 或 https://www.ams.org.cn/CN/Y2016/V52/I9/1123

图1 AZ80镁合金的动态回复型流变应力曲线及θ-ε曲线

图2 AZ80镁合金不同应变速率下的流变应力曲线

图3 变形温度250 ℃和应变速率0.1 s-1时AZ80镁合金的θ-σ及-(?θ/?σ)-σ曲线

图4 不同热变形条件下AZ80镁合金的θ-σ曲线及-?θ/?σ)-σ曲线

图5 σss, σc和σsat与σp的关系

图6 AZ80镁合金动态再结晶动力学模型参数k和n的确定

图7 AZ80镁合金动态再结晶体积分数演化规律

图8 应变为0.6和0.9时AZ80镁合金的SRS指数m分布

图9 典型热变形条件下AZ80镁合金的微观组织

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